#!/usr/bin/python
#
# Copyright 2011 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""GIT dasher domain checker class

Defines the methods to check whether the domain is the dasher domain. 
"""

__author__ = 'Xin Zhou(zhounew@google.com)'

import urllib2

class GitDasherDomainChecker(object):
  def __init__(self):
    self.DASHER_XRDS_URL_PREFIX = "https://www.google.com/accounts/o8/site-xrds?hd="
    self.XRDS_MIME_TYPE = "application/xrds+xml"
  
  def IsDasherDomain(self, domain):
    return self.CheckDasherDomain(domain)
  
  def CheckDasherDomain(self, domain):
    url = self.DASHER_XRDS_URL_PREFIX + domain
    try:
      req = urllib2.Request(url)
      response = urllib2.urlopen(req)
      content = response.read()
      if (response.getcode() == 200 and
          response.info().getheader('Content-type').find(self.XRDS_MIME_TYPE) >= 0 and
          len(content) > 0):
        return True
      else:
        return False
    except urllib2.URLError, e:
      return False